tests: add tests for go/json2

[Maniktherana]

Description

Add TestMarshalIndentPB to cover marshal.go
Add TestUnmarshalProto, TestAnnotate to cover unmarshal.go

Related Issue(s)

#14931

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c1f9c80) 47.26% compared to head (4b1bb2b) 47.26%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14964   +/-   ##
=======================================
  Coverage   47.26%   47.26%           
=======================================
  Files        1138     1138           
  Lines      238842   238842           
=======================================
+ Hits       112880   112897   +17     
+ Misses     117368   117348   -20     
- Partials     8594     8597    +3     

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[frouioui]

Coverage report for this package:

• On main
• On this PR

[frouioui]

Asides from the conversation with @ajm188, the changes in go/json2/marshal_test.go look good to me. The file went to 100% of code coverage.

I see in the same package there is the unmarshal.go file, do you think you can cover this file too?

[Maniktherana]

@frouioui sure thing, I can give it a shot

[ajm188]

one minor issue and then i think we're good to go!

requested changes made

[frouioui]

Looks perfect to me! Thanks a bunch